Analysis of chirp-pulse generated from ERL-FEL at perfect synchronism

Iijima, Hokuto; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi

We report an experimental result of measuring a mid-infrared FEL optical pulse by means of frequency-resolved optical gating (FROG) and a comparison with a numerical simulation result. The measurement was performed at JAEA ERL-FEL with the perfect synchronism condition. The FEL optical pulse was measured to be 0.6 ps of the pulse duration and 4.6 THz of the bandwidth. The simulation results were 0.5 ps and 4.4 THz, respectively. The measurement result was good agreement with the simulation result within a measurement error. The chirp in frequency domain followed a cubic function. This behavior is the so-called "self-chirp", which is not caused by a dispersive material but relation of electron-bunch parameters and FEL-undulator parameters.

Language	:	Japanese
Journal	:	Proceedings of 5th Annual Meeting of Particle Accelerator Society of Japan and 33rd Linear Accelerator Meeting in Japan (CD-ROM)
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Pages	:	p.604 - 606
Publication Year/Month	:	2008/00
Meeting title	:	第5回日本加速器学会年会・第33回リニアック技術研究会
Held date	:	2008/08
Location (city)	:	東広島
Location (country)	:	日本
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Keywords	:	no keyword
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Registration No. : BB20081493
JAEA Abstracts No. : 37000244
Paper Submission No. : 5235

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